ok...here's the scoop. i recently did my own comparison between my black sp twin-jets and a pair of tusa zooms i got as a backup set of fins. the twin-jets won hands down in terms of raw thrust. thicker, wider, stiffer, heavier sp compound offers great performance. on one dive last weekend, i was kicking furiously in the tusas against a decent current in order to reach the anchor chain, and descend on a deep dive. with the tusa's softer compound and increased flex, the best i could do was stay even with the current. i made zero headway and a deckhand had to toss out a secondary current line and pull me towards the front of the boat, and anchor chain. on the next dive with conditions remaining the same, i donned my twin-jets and was able to make headway against the current and eventually to the anchor chain unaided. however, i do think that the tusas have a place. on the first dive earlier in the day, we were anchored in a protected area and conditions were much calmer. the tusas did get me around ok on this particular dive and i did notice a small reduction in air consumption as well. more than likely due to their lighter weight, softer compound and longer, narrower profile. the tusas would make a great travel fin for areas with fairly calm and consistent conditions.
